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Linux/net/netfilter/xt_SECMARK.c

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  1 /*
  2  * Module for modifying the secmark field of the skb, for use by
  3  * security subsystems.
  4  *
  5  * Based on the nfmark match by:
  6  * (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
  7  *
  8  * (C) 2006,2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License version 2 as
 12  * published by the Free Software Foundation.
 13  *
 14  */
 15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 16 #include <linux/module.h>
 17 #include <linux/security.h>
 18 #include <linux/skbuff.h>
 19 #include <linux/netfilter/x_tables.h>
 20 #include <linux/netfilter/xt_SECMARK.h>
 21 
 22 MODULE_LICENSE("GPL");
 23 MODULE_AUTHOR("James Morris <jmorris@redhat.com>");
 24 MODULE_DESCRIPTION("Xtables: packet security mark modification");
 25 MODULE_ALIAS("ipt_SECMARK");
 26 MODULE_ALIAS("ip6t_SECMARK");
 27 
 28 #define PFX "SECMARK: "
 29 
 30 static u8 mode;
 31 
 32 static unsigned int
 33 secmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
 34 {
 35         u32 secmark = 0;
 36         const struct xt_secmark_target_info *info = par->targinfo;
 37 
 38         BUG_ON(info->mode != mode);
 39 
 40         switch (mode) {
 41         case SECMARK_MODE_SEL:
 42                 secmark = info->secid;
 43                 break;
 44         default:
 45                 BUG();
 46         }
 47 
 48         skb->secmark = secmark;
 49         return XT_CONTINUE;
 50 }
 51 
 52 static int checkentry_lsm(struct xt_secmark_target_info *info)
 53 {
 54         int err;
 55 
 56         info->secctx[SECMARK_SECCTX_MAX - 1] = '\0';
 57         info->secid = 0;
 58 
 59         err = security_secctx_to_secid(info->secctx, strlen(info->secctx),
 60                                        &info->secid);
 61         if (err) {
 62                 if (err == -EINVAL)
 63                         pr_info("invalid security context \'%s\'\n", info->secctx);
 64                 return err;
 65         }
 66 
 67         if (!info->secid) {
 68                 pr_info("unable to map security context \'%s\'\n", info->secctx);
 69                 return -ENOENT;
 70         }
 71 
 72         err = security_secmark_relabel_packet(info->secid);
 73         if (err) {
 74                 pr_info("unable to obtain relabeling permission\n");
 75                 return err;
 76         }
 77 
 78         security_secmark_refcount_inc();
 79         return 0;
 80 }
 81 
 82 static int secmark_tg_check(const struct xt_tgchk_param *par)
 83 {
 84         struct xt_secmark_target_info *info = par->targinfo;
 85         int err;
 86 
 87         if (strcmp(par->table, "mangle") != 0 &&
 88             strcmp(par->table, "security") != 0) {
 89                 pr_info("target only valid in the \'mangle\' "
 90                         "or \'security\' tables, not \'%s\'.\n", par->table);
 91                 return -EINVAL;
 92         }
 93 
 94         if (mode && mode != info->mode) {
 95                 pr_info("mode already set to %hu cannot mix with "
 96                         "rules for mode %hu\n", mode, info->mode);
 97                 return -EINVAL;
 98         }
 99 
100         switch (info->mode) {
101         case SECMARK_MODE_SEL:
102                 break;
103         default:
104                 pr_info("invalid mode: %hu\n", info->mode);
105                 return -EINVAL;
106         }
107 
108         err = checkentry_lsm(info);
109         if (err)
110                 return err;
111 
112         if (!mode)
113                 mode = info->mode;
114         return 0;
115 }
116 
117 static void secmark_tg_destroy(const struct xt_tgdtor_param *par)
118 {
119         switch (mode) {
120         case SECMARK_MODE_SEL:
121                 security_secmark_refcount_dec();
122         }
123 }
124 
125 static struct xt_target secmark_tg_reg __read_mostly = {
126         .name       = "SECMARK",
127         .revision   = 0,
128         .family     = NFPROTO_UNSPEC,
129         .checkentry = secmark_tg_check,
130         .destroy    = secmark_tg_destroy,
131         .target     = secmark_tg,
132         .targetsize = sizeof(struct xt_secmark_target_info),
133         .me         = THIS_MODULE,
134 };
135 
136 static int __init secmark_tg_init(void)
137 {
138         return xt_register_target(&secmark_tg_reg);
139 }
140 
141 static void __exit secmark_tg_exit(void)
142 {
143         xt_unregister_target(&secmark_tg_reg);
144 }
145 
146 module_init(secmark_tg_init);
147 module_exit(secmark_tg_exit);
148 

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